Manufacture of paper-board



'(ModeL) S.- H. HAMILTON.

MANUFACTURE OF PAPER BOARD. No. 269.815.- Patented Dec 26, 1882.

6 QQWQ OMM/Q amt/ UNITED STATES PATENT OFFICE.

SILAS H. HAMILTON, ()F BUSHNELL, ASSIGNOR, BY MESNE ASSIGNMENTS,

TO MARVIN A. FARR, OF CHICAGO, ILLINOIS.

MANUFACTURE OF PAPER=BARD.

SPECIFICATION forming part of Letters Patent No..269,815, dated December26, 1882.

Application filed August 13, 1878. Renewed October 24, 1881. (Modell Toall whom it may concern Be it known that I, Sums H. HAMILTON, ofBushnell, in the county of McDonough, and in the State of Illinois, haveinvented certain new and useful Improvements in the Mannfacture ofPaper-Board; and I do hereby declare that the followingis a full, clear,and exact description thereof, reference being bad to the accompanyingdrawings, makinga part of this specification, in which- Figure l is aperspective view of my improved board, a portion of one edge beingbroken to show the manner of combining the sheets; and Fig. 2 is across-section of the same.

Letters of like name and kind refer to like parts in each of thefigures.

The design of my invention is to render practicable the employment ofpaper as asubstitute for wood for building and other like purposes, 'towhich end it consists principally in an improved article of manufacturecomposed of paper-pulp, glue, and bichromate of potash mixed together,formed into sheets, and subjected to heavy rolling pressure,substantially as and for the purpose hereinafter specified.

It consists, further, in an improved article of manufacture consistingof a board composed of sheets of the before-named product which arecaused to adhere together by means of pressure, substantially as and forthe purpose hereinafter shown.

It consists, finally, in an improved article of manufacture consistingof paper pulp,- glue, bichromate of potash, alum, and silica,

formed into sheets by pressure, substantially as and for the purposehereinafter set forth.

In the use of my invention I take one and one-half ton ofpaper-pulp-preferably made from straw, cane, or other cheapmaterial.forty-nine pounds of glue,and one and one-eighthpound ofbichromate ot' potash, both in solution, and mix the same thoroughly,after lsired, the board B thus produced may be coated exteriorly withthe solution named, and then surfaced by means of oalendered or planepressure-rollers. When it is desired that the board B shall befire-proof a solution composed of fifty pounds of alum and two pounds ofsoluble glass are added to the above-named quantity of compositionbefore the same is'passed through the papenmachine. The glue operatesprimarily to cause the pulp to adhere firmly together, while theaddition of the biohro'mate of potash causes the whole to becomewater-proof.

While the proportions of ingredients before named arepret'erablyemployed, any other proportions deemed best may be used withoutdeparture from the spirit of my invention.

The article thus produced has no grain, is homogeneous and possesses ina marked degree durability and ability to resist abrasive wear, and, inaddition thereto, is not affected by heat or dampness, in consequence ofwhich it is especially adapted for use in connection with the interiorand exterior finish of buildings for residence or business purposes.

Having thus fully set forth the nature and merits of my invention, whatI claim as new 1. An improved article of manufacture composed ofpaper-pulp, glue, and biohromate of potash mixed together, formed intosheets, and subjected to heavy rolling pressure, substantially as andfor the purpose specified.

2. An improved article of manufacture consisting of a board composed ofsheets of paper-pulp, glue, and bichromate of potash, which sheets arecaused to adhere together by means of pressure, substantially as and forthe purpose shown.

3. An improved article of manufacture consisting of paper-pulp, glue,bichromate ofpotash, alum, and silica, mixed together and formed intosheets by pressure, substantially as and for the purpose set forth.

In testimony that I claim the foregoing I have hereunto set my hand this12th day of I00 August, 1878.

SILAS H. HAMILTON.

' Witnesses: GEO. S. PEINDLE,

JAS. E. EUTCHINSON.

5 which the composition is made into sheets A in the usual manner,except that said sheets are subjected to more than ordinary pressurebetween rollers. Two or more of the sheets A are then coatedexteriorly'with a solution 50 of glue and biohromate of potash, placedwith their laces in contact, and then passed between pressure-rollers,which cause said sheets to become firmly united, after which, if de-

